Báo cáo lâm nghiệp: "Estimation of genetic parameters European black poplar (Populus nigra Consequence on the breeding strategy" pdf
Báo cáo lâm nghiệp: "Estimation of genetic parameters European black poplar (Populus nigra Consequence on the breeding strategy" pdf
... 5) with a core of clones between 37 and 44 degreesEstimation of genetic parameters in the European black poplar (Populus nigra L.). Consequence on the breeding strategyCh. ... discussion, need tobe based on the genetic and economic properties of the species. The present study aims toestimate the genetic parameters in the European black poplar, ... the length of the growing season is under strong genetic control. It also matches results on Populus deltoides (FARMER, 1970 ; YtN!,1974) and on many other species of...
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Báo cáo khoa học: "Estimation of genetic parameters in eastern cottonwood (Populus deltoïdes Consequence for the breeding strategy" potx
... correlation either amongthemselves or with other traits. The high variability and the strong genetic control of these traits permitselection either among clones or amongparents ... (1988)Estimation of genetic parameters in the European black poplar (Populus nigra L.). Consequence on the breeding strategy. Ann.Sci. For. 45, 223-238Polge H. (1963) Contribution ... of information from a given number of crossings, the effect of a reduction of the number of parents on the one hand and of a reduction in the number of offsprings per...
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Báo cáo lâm nghiệp: "Estimation of the biomass stock of trees in Sweden: comparison of biomass equations and age-dependent biomass expansion factors" ppsx
... involved in the cal-culations of forest carbon sinks is needed in the negotiations of the Climate Convention. Furthermore, analysis of the sources of error and identification of the key sources ... INTRODUCTIONEstimation of the biomass and carbon stock of trees hasgained importance as a result of the Climate Convention and the Kyoto Protocol. Extraction and storage of excess carbonfrom the ... especially for the possible presence of bias, before they can be used in the nationalinventories. Furthermore, it is evident that the time series of the inventory, i.e. the biomass estimates of the earlier...
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Báo cáo lâm nghiệp: "Estimation of carbon stocks in a beech forest (Fougères Forest – W. France): extrapolation from the plots to the whole forest" pps
... choose the density of the wooddepending on the stage of decomposition.A Monte Carlo’s simulation was used to try to quantify the accuracy of these results. An analysis of the inaccuracies in the levels ... classes (2 for the soil and 3 for the humus). There was some uncertainty in the estimation of the stocks of carbon in the soil which were muchhigher in the hydromorphic zones than in the other classes. ... and the students from the University of Rennes-1. This work was financedby the GIP-ECOFOR and the Office National des Forêts as one of the Environmental Research sites on “Lowland beech”. The...
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Báo cáo lâm nghiệp:"Estimation of crown radii and crown projection area from stem size and tree position" pps
... approach is based on two assumptions. The first isthat the potential horizontal crown extension is a function of stemdiameter, and the second is that the distance between the tree and itscompetitors ... direction is limited by the position of competitors within a certain angle on both sides of the radius (Figs. 1A and 1B) and by their crown width at the height where the maximum crown extension of ... Excel software package). The 5% selected radii are the ones with the largest positive deviation from this relation. Another exponentialfit through these radii according to equation 3 derives the...
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Báo cáo sinh học: " Estimation of genetic parameters of preweaning performance in the French Limousin cattle breed" ppt
... the need for inversion of the large coefficient matrix of the mixed model equations (Henderson, 1973) or the inverse of the complete covariancematrix of the vector of ... the signand magnitude of this correlation is often a topic of some debate.For the estimation of (co)variance components REML (Patterson and Thompson,1971) is now the ... iterations or when the convergencecriterion attained 10-7, the outer iteration was then implemented for the estimation of the variance components. Iteration was finally stopped...
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Báo cáo sinh học: "Estimation of genetic parameters of egg production traits of laying hens by restricted maximum likelihood applied to a multiple-trait reduced animal model" pps
... the low residual sum of squares of the genetic model used todescribe the data, the linearity of half-sib on individual regression, the coefficient of symmetry and the ... showed a rather small genetic antagonism between the group of egg production traits and egg density on one hand and that of egg weights on the other hand. Weight of hens ... number of observations, f is the number of levels of the fixedeffect, p’ is twice the number of parents and Y§’Y§ is the quadratic form of the canonical observations after...
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Báo cáo sinh học: " Estimation of genetic parameters for body weight traits in squab pigeons" pdf
... fixedeffect of the jth foster parent; Bk is the fixed effect of the kth clutch; Sl is the fixed effect of the lth season in which the squab was hatched; E!!kvm is the randomerror. ... as the age of the squab increases, the preovipositional maternal effect on body weight may become insignificant compared to the effect of the genotype.Additive genetic ... information regarding breeding techniques and advances is lacking. No concentrated effort in selection toimprove the efficiency of production (in terms of the number of squabs...
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Báo cáo lâm nghiệp: " Comparison of three methods to determine optimal road spacing for forwarder-type logging operations" pdf
... V × CtravelTherefore the correction factor consists of a constant of 4 and the network correction factor as Cnet. e network correction factor is computed by dividing the effective mean ... function of distance.Although the cycle time equations are appropri-ate for this study, the ORS values derived from the case study cannot be applied to other areas unless they have the same non-uniform ... (m3),S – slope of skid trail (%).Equations (6) and (7) are presented based on the forwarding and travelling model, respectively. To get the optimal road spacing, the first derivation of the forwarding...
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Báo cáo lâm nghiệp: "Transformation of solar radiation in Norway spruce stands into produced biomass – the effect of stand density" doc
... found in the accuracy of PARa estimation on a seasonal basis. e use of the horizontally placed integration sen-sors does not fully correspond to the real situation of PAR absorption by the crown ... from the fundament of the relationship between biomass formation and absorbed solar radi-ation, especially for the PAR. is relation is formally described on the basis of the light-conversion ... affect the efficiency of solar energy conversion at the scale of tree ‒ stand. e objective of the present paper is to assess the effects of stand density and leaf area development on the radiation...
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